Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
23 November 2021 | Story Leonie Bolleurs | Photo Tania Allen
Dr Jana Vermaas and Ketshepileone Matlhoko are working on research that leaves your washing clean and fresh without the use of any detergents, which is also beneficial to the environment.

Cold water or hot water? Omo or Skip? Laundry blues is a reality in most households and when you add stains to the equation, then what was supposed to be part of your weekly household routine, becomes frustrating and time consuming. 

Researchers at the University of the Free State (UFS) are conducting research that is putting a whole new environmentally friendly spin on laundry day.

Sustainability and environmental conservation

Dr Jana Vermaas, Lecturer in the Department of Sustainable Food Systems and Development at the UFS, is passionate about textiles and sustainability – almost a decade ago, she conducted a study on the efficacy of anolyte as a disinfectant for textiles.

She describes the process: “During electrochemical activation, a dilute solution of natrium chloride/salt passes through a cylindrical electrolytic cell where the anodic and cathodic chambers are separated. Two separate streams of electrochemically activated water are produced. Anolyte as water was produced at the positive electrode and has a low pH, high oxidation-reduction potential and contains dissolved chloride, oxygen, and hydroxyl radical. It also has an antimicrobial effect.”

The benefits of this process are in line with her enthusiasm for environmental conservation. 

According to Dr Vermaas, the amount of water and chemicals used to clean textile articles is massive. “Chemicals used to disinfect, for example, hospital laundry, are hazardous. Not all laundries in the industry have a closed loop system or try to remove the chemicals before the wastewater is discarded.”

“Different amounts of detergents have various effects on our fauna and flora. Due to their low biodegradability, toxicity, and high absorbance of particles, detergents can reduce the natural water quality, cause pH changes in soil and water, lead to eutrophication (too many nutrients), reduce light transmission, and increase salinity in water sources.”

“But with the catholyte and anolyte process, water returns to its original status, which means that the water solution becomes inactive again after production where it existed in a metastable state while containing many free radicals and a variety of molecules for 48 hours. Thus, no chemicals are left in the wastewater. The water can therefore be recycled, not as potable water but, for example, to flush toilets or to water plants.

“We should do what we can to save water,” she says. 

Should you, like Dr Vermaas, also feel strongly about protecting the environment and want to obtain one of these machines that leaves your washing clean and fresh without the use of any detergents, you will be able to find such an appliance in South Arica. However, it does not come cheap. “It is a bit costly for residential use, but might be more accessible in the future,” states Dr Vermaas, who is of the opinion that it is a more sustainable option for commercial laundries.

Detergency properties and colourfastness 

Recently, more research has been conducted on this topic, but with a focus on the detergency properties of the catholyte to clean different textile fibres (natural and synthetic). Catholyte, she explains, is water produced at the negative electrode with a high pH, low oxidation-reduction potential, containing alkaline minerals. It also has surface active agents that increase the wetting properties, and it is an antioxidant. 

“A master’s student in the department, Ketshepileone Matlhoko, will be submitting her dissertation at the end of November on the possibility of using the catholyte as a scouring agent to clean raw wool,” says Dr Vermaas. 

The department is also conducting studies to investigate the influence of both catholyte and anolyte on colourfastness.

*Graphic: Production of electrolysed water (Nakae and Indaba, 2000). Diagram: Supplied



News Archive

Medical screening tests can help detect health risks at an early stage
2013-09-09

09 September 2013

It is once again time for the annual medical screening tests done by the Centre for Health and Wellness, which helps staff at the University of the Free State to watch their health.

All staff members are invited to participate and to find out how healthy they really are.

Dr Anette Prins, Deputy Director of the Centre for Health and Wellness, says their aim this year is to get every staff member to go for a checkup.

“For this reason, the tests will be done on different days and in different buildings. In this way, we take the test to the staff and they don’t have to come to a particular point as was done in the past.”
According to Discovery Health’s Healthy Company Index for 2013, in which the UFS also participated, about half of South African employees suffer from four or more health risk factors (blood pressure, obesity). The worst is that almost 70% of employees in this group believe that they are both fit and healthy. Fifty-three percent of those employees do not go for the essential preventative health checkups.

However, this picture may change as a result of the annual medical screening tests for staff of the UFS, because risk factors such as high blood pressure, cholesterol and high blood sugar levels can be detected at an early stage.

The tests take about 30 minutes per person and include a physical test, as well as an electronic questionnaire. The entire process is very confidential.

This year there are also prizes up for grabs, such as a Nexa Polaris 7.0 tablet and travel bags, during each session.

TIME

Monday
9 September

Tuesday
10 September

Wednesday
11 September

Thursday
12 September

Friday
13 September

09:00 – 12:00 Winkie Direko Building, K139 Agriculture Building, Lecture Hall B and C Physical Resources Hall

Stef Coetzee Building,Committee Room

Agriculture Building, K8
12:00 – 15:30 Flippie Groenewoud Building, Lapa
  • Flippie Groenewoud Building K110
  • 12:00 - 14:00 Main Building K16
George du Toit Building, Large Committee Room (3rd floor)

Francois Retief Building, Reception area

Sasol Library, K 433

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept